paleobiology
[ pey-lee-oh-bahy-ol-uh-jee or, esp. British, pal-ee- ]
/ ˌpeɪ li oʊ baɪˈɒl ə dʒi or, esp. British, ˌpæl i- /
noun
the branch of paleontology dealing with fossil life forms, especially with reference to their origin, structure, evolution, etc.